"Cut out" a set substring in Crystal Reports

I have a comment field from the database and I want to "cut out" a portion of the comment and then display the remaining string in a Crystal Report formula field. The substring that I want to eliminate is always the same, but it may not be in the same place. It may also not be in the comment at all. If it appeared in the comment, it would only appear once. I could also use some help on cutting out more than one space between the remaining text strings. For example:

DATABASE COMMENT STRING WANT TO DISPLAY
'This is a comment. Other text. More text' 'Other text. More text'
'More text. This is a comment. Other text' 'More text. Other text'
'Other text This is a comment.' 'Other text'
'More text... and more.This is a comment. More' 'More text... and more. More'
'A different comment' 'A different comment'

I've already created a formula, but need the exact code. This is pseudocode:
if string contains 'This is a comment.'
remove 'This is a comment.' and any spaces inbetween and then display comment
else
display comment

Featured Post

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Crystal Reports: 5 Tests for Top Performance
It is complete, your masterpiece report. Not only does it meet your customer’s expectations, it blows them out the water, all they want is beautifully summarised and displayed in a myriad of ways.
…

Hello everyone,
Hope you find this as helpful as we did. We have on the company I work for an application built in Delphi V with Crystal Reports 8.
We all know that Crystal & Delphi can be temperamental sometimes and the worst thing is, nearly…

Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…